Yeo Jingu

 Gong Seungyeon

 Ahn Uyeon

 Kim Kang-woo

 Lee Gigwang

A sci-fi mystery drama that takes place in both the year 2017 and the year 2037. In 2007, twin brothers, Kim Woo-jin and Kim Bum-gyun, witness an alien arrival that brings about a huge change in their lives. In 2017, Kim Woo-jin (Yeo Jin-goo), now a college student, notices that a series of suicides in his university is somehow linked to his brother, Kim Bum-gyun (An Woo-yeon). While in pursuit of the case, he meets Han Jung-yeon (Gong Seung-yeon), another college student who is investigating the serial suicides. In 2037, South Korea is now divided into General Earth, a heavily polluted place where crimes are rampant, and Smart Earth, a clean and peaceful city free from crimes. Kim Joon-hyuk (Kim Kang-woo) is a crime detective who tries to get into Smart Earth to investigate a case of twin brothers who went missing in 2017. Each episode contains two parts, the first part is set in 2017 called “Beta Project,” while the second part is set in 2037 called “Brave New World.”